The rare daily word game sweeping the globe. Find what's hidden in plain sight.
INVEX
Definition of INVEX
adjective
Of a differentiable function f:ℝn→ℝ, being such that there exists a vector valued function g such that f(x)−f(u)≥g(x,u)⋅∇f(u), for all x and u.
Wiktionary · CC BY-SA
Where it comes from
Introduced by Morgan A. Hanson in 1981 as a generalization of convex.
Etymology via Wiktionary (CC BY-SA).
Word DNA
How it is built
Same root, INVEX · 1 relative in the game
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
INVEX in OUTLIER
Players have found it on 4 boards so far.
It first turned up on Day 161, 28 October 2026. The most recent board was Day 174, 10 November 2026. Nobody has seen it on a board for 1 day.
First ever to find it
on Day 161, 28 October 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
INVEX starts with I and ends with X. Sorted, its letters read EINVX - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram. It uses X - among the least common letters in written English.
Same letters, different word
One other word uses exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Could you have found INVEX?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 161 - and most players walked straight past it.
Play today's OUTLIER